Kobold NV Specifications
Level Switches
measuring
•
monitoring
•
analysing
NV
p
: 16 bar; t
max
Material:
: 110 °C
max
brass or stainless steel
Connection:
G ¾, M 27 x 1.5
N1
1/11- 2013
KOBOLD companies worldwide:
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KOBOLD Messring GmbH
Nordring 22-24
D-65719 Hofheim/Ts.
Head Ofce:
+49(0)6192 299-0
+49(0)6192 23398
info.de@kobold.com
www.kobold.com
1
Level Switches Model NV
Description
The KOBOLD level switch model NV is a reasonably-priced
compact instrument for monitoring levels. A stainless steel
cylindrical float attached to one end of a balance arm moves up
and down with the liquid level.
The motion of the float is transferred to a permanent magnet
fitted at the other end of the balance arm. The permanent
magnet switches a reed contact that is fitted in a sliding tube
outside the medium. The tube is set as a N/O contact at the
factory, that is, the contact closes when the level rises. The
switching function is reversed by moving the tube. The
instruments are delivered in standard sleeves for side installation.
PTFE tape is used to seal the switch.
Dimensions
155 or 130
155 bzw. 130
94 50 oder 25
min. 63
30 AF 32 AF
50 or 25
3
G ¾ or M 27 x 1.5
G
/4 oder M 27x1,5SW 32SW 30
Ø 21
Re-adjusting the contact unit
To re-adjust the contact unit the locking plate on the top part of
the housing must be loosened and the contact unit moved.
Blue (white) or red arrows are situated on the contact unit for
re-adjustment purposes. The front edge of the locking plate
serves as an adjustment mark.
Technical Details
Housing: NV-11..: brass, Ms 58
NV-12..: stainless steel, 1.4301
Connections: NV-11..: brass, Ms 58
NV-12..: stainless steel, 1.4301
Float: stainless steel, 1.4301
Leaf spring: stainless steel, 1.4310
Balance arm: stainless steel, 1.4310
Sleeve: NV-11..: brass, Ms 58
NV-12..: stainless steel, 1.4301
Contact tube: Polyamide
Seal: NV-11..: NBR
NV-12..: FPM
Max. temperature: 110 °C
Max. pressure: 16 bar
Installation position: horizontal
Bistable reed contact
R N/O contact / N/C contact Standard
max. 2 A, max. 230 V
AC/DC
,
max. 40 W, 40 VA
U Changeover contact Standard
max, 0.5 A, max. 150 V
AC/DC
,
max. 20 W, 20 VA
C N/O contact / N/C contact
2 A, 20 V
, 0.18 A, 230 VAC,
AC
max. 40 W
D Changeover contact
0.13 A, 150 V
, 0.5 A, 40 VAC,
AC
max. 20 W
Electrical connection: PVC cable
Contact resistance: max. 80 m Ω
Closing point: max. 6 mm (above centre line)
Opening point: max. 3 mm (below centre line)
Switching hysteresis: approx. 8 mm
Ex-range: ATEX-zone 1 as »simple apparatus«
3
Density: > 0.8 kg/dm
... 25 mm float
> 0.7 kg/dm3 ... 50 mm float
Protection: IP 65
N/O contact:
Adjust the contact unit near the red arrow. The contact closes
as the liquid level rises.
N/C contact:
Adjust the contact unit near the blue (white) arrow. The
Applications
Heating boilers
Car washes
Cleaning machines
contact opens as the liquid level rises.
Order Details (Example: NV-1101R1)
Model Material Connection/length of float Contact type Cable type / length
PVC cable
1 = 1.5 m (Standard)
1)
NV-
1)
only for N/O contact "R" and "C"
2
11 = brass
12 = stainless steel
01 = G ¾; 25 mm
02 = M 27 x 1.5; 25 mm
03 = G ¾; 50 mm
04 = M 27 x 1.5; 50 mm
2)
length as described 3) only for N/O contact "R"
www.kobold.com
R = N/O contact (Standard CE)
C = N/O contact (cCSAus)
U = Changeover contact (Standard CE)
D = Changeover contact (cCSAus)
2 = 2.0 m
4 = 3.0 m1)
6 = 4.0 m1)
8 = 5.0 m
P = PVC cable, special length
S = Siliconecable
G = yellow PUR cable
1)
2)3)
2)3)
No responsibility taken for errors;
subject to change without prior notice.
2)
1/11- 2013
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